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is in decline. researchers at the australian institute of marine science say the reef has lost half of its coral cover over the past 27 years. there are multiple causes, including a destructive kind of starfish shown here. we look at what's behind it and what's at stake-- in australia and around the world-- with nancy knowlton, a coral reef biologist and a chair of marine science at the smithsonian national museum of natural history here in washington. welcome. >> thanks. how has all of this coral died off? do we know what's causing it? is it all that... >> it's not all the star fish. the star fish is about 42%. typhoons, big strong storms another 48% and then coral bleaching is the remaining 10% which is caused whenever the water gets too hot. >> ifill: so this is human causedded? >> yes. most of it is human caused. i mean a coral reef naturally goes through cycles of up and down. but it shouldn't be declining by half over course of 27 years. >> ifill: i feel like we have talked before about the declining coral cover. but not... but i'm wondering whether it's now picking up speed or whether thi
of being a science fair project and give it to the opportunity to take on the goliath problem of the 21st century, bad water, we call the project slingshot because slingshot was the little piece of technology that was given to david and as the kid i remember the story of david and goliath and the moral to me was you use technology properly, slingshot and you will take out goliath. >> rose: so what do we have here? i want to show it in just a moment. >> so in this little accurate scale model of a shipping container which could be put into a village, is -- >> rose: shipping container. there is an actual model of a standard shipping container, this is eight feet by ten feet by 20 feet, here is the actual scale model next to a person of the slingshot. >> rose: right. >> it makes 1,000-liters of water a day and even if you closeup at night and hopefully the women that will run this downtown, it will sit inside here all night filling up thousand liter reservoirs that are accessible outside so all day and all night people can get clean water, be but basically the this is the downtown, if you al
science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: israel's prime minister warned again today that iran is well on its way to creating a nuclear weapon and said the world needs to act. benjamin netanyahu spoke at the united nations. as he has often before, netanyahu condemned iran and its nuclear program, and called on other leaders to do the same. >> at stake is not merely the future of my country. at stake is the future of the world. and nothing could imperil our common future more than the arming of iran with nuclear weapons. >> woodruff: the israeli prime minister said the hour is, quote, "getting late" to stop iran as it continues its nuclear work. >> i speak about it now because the iranian nuclear calendar doesn't take time out for anyone or for anything. i speak about it now because when it c
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